Boston Police Commissioner Ed David said that there is not anyone in custody for the dual bombings at the Boston Marathon, Yahoo News reported. Officials made a public plea to turn over any photographic or digital evidence they have from the scene.
"There have to be hundreds if not thousands of photographs or video or observations there were made at the finish line. I would encourage you to bring it forward," Massachusetts State Police Superintendent Timothy Albert said.
FBI Special Agent in Charge Richard DesLauriers said they are "just beginning upon that path" of processing the crime scene and following up on leads from the public.
President Obama weighed in, giving his second public statement on Tuesday calling the double bombings as a "heinous and cowardly act," and that "we still don't know who carried out the attack, whether it be individual or individuals. We all have a part to play in helping the leads [for law enforcement]. We don't have a sense of motive; everything is speculation," he said. "We will find whoever harmed our citizens and we will bring them to justice." The president received a briefing from Assistant for Homeland Security and Counter-terrorism Lisa Monaco, FBI Director Robert Mueller and other senior members of his counter terrorism team.
On Tuesday morning, Boylston Street remained closed, but Boston officials reopened some of the perimeter around the site of the explosions.
Davis called the area "the most complex crime scene we've dealt with in the history of our department."
The race reportedly receives about 23,000 runners from all over the world. The two bombs exploded several hundred feet away within thirteen seconds, the New York Times reported. There were conflicting reports about how many devices were used.
Initially, five were said to have been disabled by police, but that was later changed. The official said that the devices appeared to have been made with black powder and ball bearings, which are hallmarks that the intent was to kill as many people, terrorism experts said.
